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扩孔锚杆属于岩土工程新技术,大多数的国内基坑支护规程或公路边坡支护规程尚未编入扩孔锚杆设计内容。本文试图对国内目前的各种锚杆扩孔技术进行总结分析,指出各种方法的优缺点及其适用范围。文章给出扩孔锚杆相关的设计计算式,通过与现场试验的数据进行分析,并与现行国家行业规范给出的计算公式比较,证明作者给出公式及其参数取值科学合理。此外,总结施工中常见问题及相应的处理措施,对扩孔锚杆设计及施工均具有重要的参考价值。
The reaming bolt belongs to the new technology of geotechnical engineering. Most of the domestic foundation pit supporting rules or the supporting regulations of the highway slope have not been incorporated into the design of reaming bolt. This paper attempts to summarize the current domestic variety of bolt reaming techniques, pointing out the advantages and disadvantages of various methods and their applicability. The paper gives the calculation formula of the reaming bolt, compares it with the data from the field test, and compares it with the calculation formula given by the current national industry standard to prove that the formula given by the author and the parameter value are scientific and reasonable. In addition, summarizing the common problems in construction and the corresponding treatment measures have important reference value for the design and construction of reaming bolt.